Advertisements
Advertisements
प्रश्न
Name the device or machine which convert :
Electrical energy into light energy.
उत्तर
An electric bulb converts electrical energy into light energy.
APPEARS IN
संबंधित प्रश्न
A ball is placed on a compressed spring. What form of energy does the spring possess? On releasing the spring, the ball flies away. Give a reason.
A stone of mass 500 g is thrown vertically upwards with a velocity of 15 m/s. Calculate:
- the potential energy at the greatest height,
- the kinetic energy on reaching the ground, and
- the total energy at its half-way point.
What kind of energy is possessed by the following?
A stone kept on roof-top _______________
Name the device which converts electrical energy into mechanical energy.
Name the device or machine which convert :
Electrical energy into sound energy.
Five electric fans of 120 watts each are used for 4 hours. Calculate the electrical energy consumed in kilowatt-hours.
Explain the transformation of energy in the following cases :
(i) A ball thrown upwards.
(ii) A stone dropped from the roof of a building.
How much electric energy in kWh is consumed by an electrical appliance of 1000 watts when it is switched on for 60 minutes?
Name the energy transfers which occur when :
an electric ball rings
The device which converts mechanical energy into energy which runs our microwave oven is :
